77, Slot, Slotting notch, slot
Means the PCB board or board of edge somewhere, in order to meet the demand for assembly, while the subject of a "slot" to serve as matching that of the notch. In the Finger Edge, is also known as "partial tank" or "positioning groove" (Polarising Slot or Locating Slot), is deliberately open-side in order to avoid finger vaginal insert anti joint.
78, Solder Dam embankment tin
Refers to the thickness of solder joints around the formed by masking the embankment to prevent high temperatures in the flow of molten solder caused by the short circuit, usually in the dry-film easier to form a film of solder Solder Dam.
79, Solder Plug plug tin, tin-chu
Refers to the influx of wave soldering in plated through hole solder, cooling after stay in the hole to become a part of the conductor, known as "tin congestion." If the hole has been part plug pin, then solder plug also has a "solder points" function. As for the current general is no longer used for docking, while the purpose of interconnection Zhizuo PTH, while more than 20 mil in diameter, has been replaced by the following hole, known as vias (Via Hole). The ends of these holes are covered with or filled with masking, to prevent entry of solder flux, and melt, which lead through-hole course, there will be no Solder Plug the.
80, Solder Side Solder side
Early circuit board assembly entirely THT mainstream, the front board (ie, components, surface) is often used cartridge components, its wiring multi-click "board horizontal" direction ordered. The opposite would be needed to meet the board through the wave of welding tin-lead wave, it is known as "welding area," often by the side line, "long board" direction wiring, to conform with the flow of solder wave. This term there are other called Secondary Side, Far Side and so on.
81, Spacing spacing
That two parallel conductors of the width of the insulation in terms of open space, usually the "spacing" and "line" the two together as "line pairs" (Line Pair).
82, Span span
Refers to two special purpose covered by the width between points, or a target point and the distance between the reference point.
83, Spur highlight the edge of the film graphics
Refers to a transparent film on the area or the dark zone line graphics, while its edges Resolving ambiguity occurs when the non-performing, often undue stand out, called Spur.
84, Step and Repeat successive repeated exposure
Small size of the circuit board for the production of convenience, in the film-production would often repeat the same pattern are arranged in a larger film. System uses a special Step and Repect type exposure machine, the same small-scale pattern successive partial re-exposure, and even become a big film, and then for volume production.
85, Supported Hole (metal) support through-hole
Refers to the normal plated through-hole (PTH), which has a metal drill hole walls. Are generally omitted in front of "support" of the word. The original meaning refers to the pin can be conductive and the provision of through-hole soldering purposes.
86, Tab contacts, Goldfinger
In the circuit board refers to the Edge series in terms of contact of the finger, for an informal argument.
87, Tape Up Master the original hand-Chip
Early circuit board of the film, not the use of CAD / CAM and laser plotter produced, but rather to adopt a variety of special black "posted items" (such as lines, circular pad, finger, etc. Size range of special products, to Bishop's The most widely used products), within the square piece of paper hand-eye and paste on the original "Patch" (Tape Up Master), then the camera into a first-generation shrink according to the original film (Master Artwork). More than ten years ago in Japan there are many circuit boards, hand patch work, that is, air travel between Taiwan for OEM. In recent years, as computers developed and accurate, has already replaced manual actions.
88, Terminal Clearance terminal air ring, ring terminals so that
Including laminates of the ground (Ground) or voltage (Power) two large copper surface, as "plated through-hole" I would like from the inner plate through but does not want to connect, you can first hole is located at the copper surface erosion out and stay out of a large circular open space, then when PTH copper hole wall is completed, there will naturally be one of its peripheral wall "of an empty ring." Also printed masking the surface of the outer laminates, each of the holes to be welded around the ring and let a "circular open space" and avoid masking stains and even into the hole welded ring. The two "Empty Ring" also known as "Terminal Clearance".
89, Terminal Terminal
Broad-called "terminal" refers to the electrical connections as a variety of devices or parts. The narrow usage of the circuit board refers to a variety of inner and outer ring holes (Annumlar Ring) is concerned. There are a synonym Pad, Land, Terminal Area, Terminal Pad, Solder Pad and so on.
90, Thermal Relief heat-type hollow
Whether the outer board, including a large copper surface area of its continuing integrity are to be too large, so as not to board at high temperature (such as welding), and the copper plate due to differences in expansion coefficient between the plates caused by Alice, floating away from the , or blister and other illnesses. Is generally in large copper surface mining, "tennis" type of hollow, in order to reduce thermal shock. This term is also known as Halfonning or Crosshatching so. UL certification requirements in its "yellow card", you need to be posted on the board of the largest diameter of copper surface, which is a kind of security considerations.
91, Thermal Via thermal holes, cooling holes
Is distributed in the high-power (such as 5W or more) of large parts (such as the CPU or any other driver IC) ventral surface of bottom hole, such through-hole interconnection capabilities Zhizuo non-conductive cooling purposes. Sometimes connected with the larger copper surface in order to increase the direct cooling effect. These cooling holes on the Z direction of thermal stress has a soothing effect. Precision Daught Card of the eight layers of small plates, or in some BGA double-sided board, they are often arranged in such a lattice cooling holes, and two-faced gold-plated "Cooling Tower" and other designs.
92, Throwing Power Distribution Power
When the plating carried out, as a result of work at the cathode material by its shape, creating a "primitive current distribution" (Primary Current Distribution) level of inequality, while differences in coating thickness occurs. At this point I added in a variety of organic bath additives (such as gloss agents, leveling agents, wetting agents, etc.), so that the original high-current cathode surface area, in a variety of organisms under the influence of the original fast-growing thick coatings have a slowing effect, so that it can bring us closer to a low-current region in the coating thickness differences. This bath of organic additives on the cathode plate thickness to improve the distribution of capabilities, known as the Bath's "distribution of power" is a need to cope with the complexity of a high degree of experimental results. When the wet electrolytic process of anodization, then this "distributed power" term also applies to the work hanging in the anode material. Such as the anodized aluminum parts, is a common example.
93, Thermo-Via thermal Kong
IC refers to the circuit board of a large high-power components, will occur at work, large amounts of heat, assembling panels must be ranked this extra heat dispersed, so as not to jeopardize the life of electronic devices. One of the simplest cooling method is the use of the surface visco-mounted large-scale IC base plate open space, plus production deliberately PTH, will be issued by large-scale IC heat directly to the board on the back of a large copper surface to conduct heat . Such dedicated to conductive heat transfer rather than through-hole, known as Thermo-Via.
94, Tie Bar diversion of
In the circuit board industry, refers to the plate surface after etching by an independent line up, and if needed to do further plating, it should be pre-installing conductive path in order to continue. For example, in finger area of copper surface, further nickel-plated, only left behind by the Special Bus Bar (BUS), and Tie Bar to connect the current from the cathode rod. This temporary use two kinds of conductive "tool line" in the board after the completion of both will be removed from the board edge.
95, Tooling Feature tool for the subject matter of
Refers to the circuit board system in a variety of production and group process, for positioning, alignment, reference of the various markers. Such as tools Kong, reference points, cut points, reference lines, positioning holes, positioning slot, alignment marks, with a total known as the "tools subject matter."
96, Trace lines, wires
Refers to wire or circuit board in general terms, usually does not include the through-hole, the earth, and pore ring pad. The original text as a "line" terminology still used in Track, Line, Line Run, Conductor and so on.
97, Trim Line cutting Line
Board outside the finished product, in the cutting shape to be followed when the boundary line is called Trim Line.
98, True Position true bit
Means the circuit board hole or board a variety of subject matter (Feature), the other is located in the design of the theory on the location, known as the true position. However, the transfer of a variety of graphics, as well as machining process and so on, can not help but have hidden the error tolerances, it is impossible for each piece are accurate. When the board at completion, as long as "subject" is still required in a true position tolerance circle radius of the area within the (True Position Tolerance), without affecting the assembly and terminal functions, then its quality can be Acceptable.
99, Unsupported Hole of non-plated through-hole
Refers to not do turn-on or a cartridge parts purposes, nor the drill hole wall in terms of copper, usually most of these NPTH aperture large, such as 125 mil of the lock bolt holes that is.
100, Via Hole-hole lead
Refers to the circuit board conductive interconnection of only the use, rather than Zaicha PTH foot in terms of welding parts. These vias are through the whole board, "all-pass pilot hole" (Through Via Hole), there is only connected to the board without a full run through of "Blind Hole" (Blind Via Hole), there is no access with the plate surface Tong was buried in the plate inside the "buried vias" (Buried Via Hole) and so on. Such a complex partial hole is based on successive continuous pressure legitimate (Sequential Lamination) are finished. This term is also often referred to as "Via".
101, Voltage Plane Clearance voltage level air ring
When the plated through-hole through the plywood to the Built-in voltage level, rather than want to contact with them when the voltage level at the surface of copper etching out the first round open space, press together and then this larger open space on the drilled a smaller hole, and continue to the completion of PTH. At this point the tubular hole copper wall and voltage between the surface layer of a huge bronze statue, that is a circle to the existence of an empty ring insulation, known as Clearance.
102, Voltage Plane voltage level
Refers to the circuit board drives the voltage required for the various parts may, by board of a public area of copper conductor to be supplied, or as a multilayer board with a level of voltage levels, such as the four-layer board two inner One of the voltage level (such as 5V or 12V), generally Vcc notation. Another level is the ground layer (Groung Plane). In addition to the voltage level is usually plywood supply spare parts required for the voltage, but also cater to heat (Heat Sinking) and barrier (Shielding) the function.
103, Wiring Pattern routing graph
Means the circuit board design the "wiring" graphics, and Circuitry Pattern, Line Run Pattern and other synonyms.
104, Working Master master piece of work
Refers to the size ratio of 1:1 can be used for the production of the film circuit board and directly Zaifan actual use made of the production line of the film, which termed the original negatives Working Master. CAD Computer Aided Design; Computer Aided Design CAE Computer Aided Engineering; Computer-Aided Engineering CAM Computer Aided Manufacturing; computer-aided manufacturing MLB Multilayer Board; plywood (referring to Multilayer PCB's) PCB Printed Circuit Board; printed circuit board (also to do PWB, including rooms for Wiring, but it is now even more abbreviated Printed Board. mainland term for "printed circuit board") SMOBC Solder Mask Over Bare Copper; masking printed directly on the bare copper (that is, spray tin plate)
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